JP2017073473A - Terminal structure of transformer - Google Patents

Terminal structure of transformer Download PDF

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JP2017073473A
JP2017073473A JP2015199825A JP2015199825A JP2017073473A JP 2017073473 A JP2017073473 A JP 2017073473A JP 2015199825 A JP2015199825 A JP 2015199825A JP 2015199825 A JP2015199825 A JP 2015199825A JP 2017073473 A JP2017073473 A JP 2017073473A
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transformer
terminal
cable
load
earthquake
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常樹 松木
Tsuneki Matsuki
常樹 松木
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To solve such a problem of a conventional low voltage dry transformer that a load generated at the transformer terminal by cable vibration at the time of earthquake is not taken into account, and the terminal may possibly be broken, by the seismic force or the wiring.SOLUTION: In the terminal structure of a transformer including a support bracket 2 fixed to the transformer core 1, a transformer terminal 4 fixed to the support bracket 2 via an insulator 3 and connected with a cable 7, and a lead wire 6 led out from the transformer oil 5 and connected with the transformer terminal 4, displacement in the horizontal direction of the support bracket 2, at a position for fixing the transformer terminal 4, is set to a predetermined value or less, even if it is subjected to the load at the time of earthquake.SELECTED DRAWING: Figure 1

Description

この発明は、変圧器の端子構造、特に、強い地震力に対しても破損しない端子部を持つ低圧乾式変圧器の端子構造に関するものである。   The present invention relates to a terminal structure of a transformer, and more particularly to a terminal structure of a low-voltage dry transformer having a terminal portion that is not damaged even by a strong seismic force.

従来の変圧器においては、変圧器の端子部の破損は主に配線の余長不足により発生するものと考えられており、ケーブル振動の荷重評価に基づく強度設計は考慮されていない。
端子部の破損を防止した変圧器は、例えば特許文献１（第６図）に示すように、変圧器１次側端子を軟銅線で構成することにより、外力に対する伸び率を確保し、断線を抑えて振動を吸収している。また、例えば特許文献１（第５図）に示すように、変圧器２次側端子に接続する引き出し線を分割することにより、分割した引き出し線相互の振動の位相を変え、引き出し線の振動によりコイルに印加される力を抑制している。 In the conventional transformer, it is considered that the breakage of the terminal portion of the transformer is mainly caused by the shortage of the wiring length, and the strength design based on the load evaluation of the cable vibration is not taken into consideration.
For example, as shown in Patent Document 1 (FIG. 6), the transformer that prevents the terminal portion from being damaged is constituted by an annealed copper wire on the primary side of the transformer so as to ensure an elongation rate with respect to an external force and to prevent disconnection. It suppresses and absorbs vibration. For example, as shown in Patent Document 1 (FIG. 5), by dividing the lead wire connected to the transformer secondary terminal, the phase of vibration between the split lead wires is changed, and the vibration of the lead wire is changed. The force applied to the coil is suppressed.

特開２００９−１４７１９６号公報JP 2009-147196 A

従来の低圧乾式変圧器では、変圧器全体の耐震性について考慮されているものの、地震時の端子部に発生する荷重が考慮されていないため、地震力や配線の方法によっては、ケーブル振動により端子部が破損する可能性があった。
この発明は上記のような課題を解決するためになされたものであり、地震発生時に破損しない端子部を持つ変圧器を得ることを目的とする。 In conventional low-voltage dry transformers, although the earthquake resistance of the entire transformer is considered, the load generated at the terminal part during an earthquake is not taken into account, so depending on the seismic force and wiring method, the terminal may be caused by cable vibration. The part could be damaged.
The present invention has been made to solve the above-described problems, and an object thereof is to obtain a transformer having a terminal portion that is not damaged when an earthquake occurs.

この発明は、変圧器鉄心と固定された支持金具、碍子を介して前記支持金具と固定され配線用ケーブルが接続される変圧器端子、変圧器コイルから引き出され前記変圧器端子に接続された引き出し線を備えた変圧器の端子構造において、前記変圧器端子及び前記碍子は変形しない固さを持つ部材で構成して、地震時に受ける前記変圧器端子の荷重が前記碍子を介して前記変圧器端子と固定される前記支持金具に伝わるように構成するとともに、地震時の荷重を受けても前記引き出し線を介して前記変圧器コイルが破損されないよう前記支持金具は前記変圧器端子を固定する位置での水平方向の変位が所定値以下となるようにしたものである。   The present invention relates to a support fitting fixed to a transformer core, a transformer terminal fixed to the support fitting via a lever and connected to a wiring cable, a drawer drawn from a transformer coil and connected to the transformer terminal In the terminal structure of the transformer provided with a wire, the transformer terminal and the insulator are made of a member having a hardness that does not deform, and the load of the transformer terminal that is received during an earthquake is transmitted through the insulator through the transformer terminal. The support metal fitting is fixed at the position where the transformer terminal is fixed so that the transformer coil is not damaged through the lead wire even if it receives a load during an earthquake. The horizontal displacement is set to be equal to or less than a predetermined value.

この発明によれば、強い地震力に対しても破損しない端子部を持つ変圧器を得ることができる。   According to the present invention, it is possible to obtain a transformer having a terminal portion that is not damaged even by a strong seismic force.

この発明に係る実施の形態１における変圧器の端子構造を示す概念図である。It is a conceptual diagram which shows the terminal structure of the transformer in Embodiment 1 which concerns on this invention. この発明に係る実施の形態１におけるケーブル動作の詳細な説明図である。It is detailed explanatory drawing of the cable operation | movement in Embodiment 1 which concerns on this invention. この発明に係る実施の形態１における端子部動作の詳細な説明図である。It is detailed explanatory drawing of the terminal part operation | movement in Embodiment 1 which concerns on this invention.

実施の形態１． Embodiment 1 FIG.

以下、この発明の実施の形態１を図１に基づいて説明する。図１は、この発明に係る実施の形態１における変圧器の端子構造を示す概念図である。
図１において、変圧器の端子部は鉄心１と、鉄心に取り付けられた支持金具２と、碍子３を介して支持金具２に取り付けられた変圧器端子４からなる。変圧器端子４は、コイル５からの引き出し線６に接続されている。また、変圧器端子４は配線用のケーブル７に接続されており、また、ケーブル７の他端は鉄心１を有する変圧器を収容する盤の筐体８に設けた盤内端子９に接続されている。盤内端子９は外部端子（図示せず）を介して外部回路に接続される。そして、盤内端子９は、固縛で代用することができる。 A first embodiment of the present invention will be described below with reference to FIG. 1 is a conceptual diagram showing a terminal structure of a transformer according to Embodiment 1 of the present invention.
In FIG. 1, the terminal portion of the transformer includes an iron core 1, a support fitting 2 attached to the iron core, and a transformer terminal 4 attached to the support fitting 2 via an insulator 3. The transformer terminal 4 is connected to the lead wire 6 from the coil 5. Further, the transformer terminal 4 is connected to a cable 7 for wiring, and the other end of the cable 7 is connected to an in-panel terminal 9 provided in a casing 8 of the panel that houses the transformer having the iron core 1. ing. The in-panel terminal 9 is connected to an external circuit via an external terminal (not shown). And the terminal 9 in a board can be substituted by lashing.

ケーブル７の長さには、地震による変圧器端子４の変位や、盤内端子９の変位を吸収可能な余長を確保する。また、変圧器端子４および盤内端子９等のケーブル端を固定点とした振り子運動が発生しないよう、ケーブル７の余長は最小限に留める。更に、ケーブル７の素材およびケーブル７の配線経路は、フレキシブル導体等の容易に変形可能なものを選定し、変圧器端子４と盤内端子９の間に張力が働かないようにする。   The length of the cable 7 ensures a surplus length capable of absorbing the displacement of the transformer terminal 4 and the displacement of the terminal 9 in the panel due to the earthquake. Further, the extra length of the cable 7 is kept to a minimum so that the pendulum motion does not occur with the cable terminals such as the transformer terminal 4 and the in-panel terminal 9 being fixed points. Further, the material of the cable 7 and the wiring path of the cable 7 are selected to be easily deformable, such as a flexible conductor, so that no tension acts between the transformer terminal 4 and the panel terminal 9.

変圧器端子４の固有振動数は、地震の卓越振動数より十分大きい２０Ｈｚ以上となるように設計する。固有振動数評価の際は、ケーブル７の重みを付加した状態での固有振動を考慮する。また、変圧器の鉄心１、支持金具２、碍子３と一体となった固有振動を考慮する。盤内端子９についても、ケーブル７の重みを付加した状態での固有振動数、および筐体８と一体となった固有振動数が２０Ｈｚ以上となるように設計する。   The natural frequency of the transformer terminal 4 is designed to be 20 Hz or more, which is sufficiently larger than the dominant frequency of the earthquake. When evaluating the natural frequency, the natural vibration with the weight of the cable 7 added is taken into consideration. In addition, the natural vibration integrated with the transformer iron core 1, support fitting 2, and insulator 3 is considered. The panel terminal 9 is also designed so that the natural frequency with the weight of the cable 7 added and the natural frequency integrated with the housing 8 are 20 Hz or more.

地震時に変圧器端子４にかかる荷重は、余長を持った容易に変形可能なケーブル７の振動を元に以下のように評価する。
ケーブルの重さをｍ、ケーブル端の固有振動数をｆ0、地震の振動数をｆ、ケーブルの余長をｌ、地震力をＡ[G]とし、ケーブル端に作用する最大の力Ｆを次式として評価する。
Ｆ＝ｍ×８πｆ0×(ｌ＋Ａ×９．８／（２πｆ）2)×ｆ
地震の振動数が１〜１０Ｈｚの中間で卓越する場合を想定し、ｆ＝１[Hz]とｆ＝１０[Hz]とでＦを評価し、いずれか大きい方の力を評価荷重とする。 The load applied to the transformer terminal 4 during the earthquake is evaluated as follows based on the vibration of the easily deformable cable 7 having a surplus length.
The cable's weight is m, the natural frequency of the cable end is f0, the frequency of the earthquake is f, the extra length of the cable is l, the seismic force is A [G], and the maximum force F acting on the cable end is Evaluate as an expression.
F = m × 8πf 0 × (l + A × 9.8 / (2πf) 2 ) × f
Assuming that the seismic frequency is dominant in the middle of 1 to 10 Hz, F is evaluated at f = 1 [Hz] and f = 10 [Hz], and the larger force is set as the evaluation load.

ケーブル７端に働く力は、変圧器端子４と盤内端子９で分担するが、変圧器端子４が全ての力を負担すると仮定して設計する。また、盤内端子９についても、同様に全ての力を負担すると仮定する。
仮にケーブル７の重さをｍ＝０．５[kg]、変圧器端子４の固有振動数をｆ0＝２０[Hz]、余長をｌ＝０．０５[m]、地震力を２[G]とすると、
ｆ＝１[Hz]時にＦ＝１３８[N]＝１４．１[kg重]となる。
また、ｆ＝１０[Hz]時にＦ＝１３９[N]=１４．２[kg重]となるため、１４．２[kg]の荷重を評価荷重とする。 The force acting on the end of the cable 7 is shared by the transformer terminal 4 and the in-panel terminal 9, but the design is made assuming that the transformer terminal 4 bears all the force. Similarly, it is assumed that all the forces are borne for the in-panel terminal 9 as well.
Temporarily, the weight of the cable 7 is m = 0.5 [kg], the natural frequency of the transformer terminal 4 is f0 = 20 [Hz], the extra length is l = 0.05 [m], and the seismic force is 2 [G]. ]
When f = 1 [Hz], F = 138 [N] = 14.1 [kg weight].
Further, since F = 139 [N] = 14.2 [kg weight] at f = 10 [Hz], a load of 14.2 [kg] is set as the evaluation load.

ケーブル７から変圧器端子４に上記の荷重が加わった時に、コイル５および引き出し線６を破損させないよう、変圧器を以下のように設計する。
変圧器端子４と支持金具２とを２箇所以上で、もしくは平面状に固定し、変圧器端子４に加わる荷重が支持金具２に伝わるようにする。変圧器端子４および碍子３は、荷重で変形しない固さを持つ部材で構成することにより、変圧器端子４への荷重が支持金具２に伝わるようにする。
支持金具２は、軟鋼等の素材で構成するものとし、全ての荷重を受けても変形しないように固く設計する。具体的には、変圧器端子４を固定する位置での水平方向の変位が所定値以下、具体的には１ｍｍ以下となるように設計する。また、上下方向の変位は１ｍｍと比較して無視できる大きさとなるように設計する。 The transformer is designed as follows so that the coil 5 and the lead wire 6 are not damaged when the load is applied from the cable 7 to the transformer terminal 4.
The transformer terminal 4 and the support fitting 2 are fixed in two or more places or in a planar shape so that the load applied to the transformer terminal 4 is transmitted to the support fitting 2. The transformer terminal 4 and the insulator 3 are made of a member having a hardness that is not deformed by a load, so that the load to the transformer terminal 4 is transmitted to the support fitting 2.
The support metal fitting 2 is made of a material such as mild steel, and is designed so as not to be deformed even if it receives all loads. Specifically, the horizontal displacement at the position where the transformer terminal 4 is fixed is designed to be a predetermined value or less, specifically, 1 mm or less. The vertical displacement is designed to be negligible compared to 1 mm.

引き出し線６は、導電性に優れた銅の素材で構成するものとし、支持金具２と比較して十分柔らかい設計とする。具体的には、支持金具２の変形により変圧器端子４が水平方向に１ｍｍ程度移動してもコイル５が破損しないように設計する。設計例としては、支持金具２と比較して水平方向の変形に対するバネ剛性が１/１０以下となるように引き出し線６を設計する。このようにすると、コイル５にかかる荷重が変圧器端子４にかかる荷重の１/１０以下となる。   The lead wire 6 is made of a copper material having excellent conductivity, and has a sufficiently soft design as compared with the support fitting 2. Specifically, the coil 5 is designed not to be damaged even if the transformer terminal 4 moves about 1 mm in the horizontal direction due to the deformation of the support metal 2. As a design example, the lead wire 6 is designed so that the spring rigidity against deformation in the horizontal direction is 1/10 or less as compared with the support fitting 2. If it does in this way, the load concerning the coil 5 will be 1/10 or less of the load concerning the transformer terminal 4. FIG.

次に、地震時の挙動について、図１および図２、図３で説明する。図２はケーブル動作の詳細な説明図であり、図３は端子部動作の詳細な説明図である。
地震が発生した時、図１のケーブル７はケーブル端から外力を受け、地震に含まれる振動数において振動するものとして評価する。ケーブル７は容易に変形可能なため、図２の（ａ）、（ｄ）、（ｅ）、（ｈ）のように最大に変形している時に限り、ケーブル端に張力が作用する。また、ケーブル端に張力が作用した時に限り、ケーブル７には外力が働き、振動方向が変わる。 Next, behavior during an earthquake will be described with reference to FIGS. 1, 2, and 3. FIG. 2 is a detailed explanatory view of the cable operation, and FIG. 3 is a detailed explanatory view of the terminal portion operation.
When an earthquake occurs, the cable 7 in FIG. 1 receives an external force from the end of the cable and is evaluated as vibrating at the frequency included in the earthquake. Since the cable 7 can be easily deformed, a tension acts on the cable end only when it is deformed to the maximum as shown in FIGS. 2 (a), (d), (e), and (h). Further, only when tension is applied to the cable end, an external force acts on the cable 7 to change the vibration direction.

具体的には、図１の変圧器端子４および盤内端子９等のケーブル端の固有振動数が２０Ｈｚ以上となるように設計しているため、ケーブル端は建屋床面と一体となって振動するものとして評価する。
図２の（ａ）のように、移動によりケーブル７にたるみがなくなると、ケーブル７に張力が発生しケーブル全体が移動する。図２の（ｂ）、（ｃ）のように、ケーブル端が減速を開始すると、ケーブル７はたるんでケーブル端を通り越して移動を続ける。図２の（ｄ）のように、ケーブル７のたるみがなくなった時点でケーブル７はケーブル端から外力を受けて、移動の方向が反転する。 Specifically, since the natural frequency of the cable ends such as the transformer terminal 4 and the in-panel terminal 9 in FIG. 1 is designed to be 20 Hz or more, the cable end vibrates integrally with the building floor. Assess what you want to do.
As shown in FIG. 2A, when there is no slack in the cable 7 due to movement, tension is generated in the cable 7 and the entire cable moves. As shown in FIGS. 2B and 2C, when the cable end starts to decelerate, the cable 7 sags and continues to move past the cable end. As shown in FIG. 2D, when the slack of the cable 7 disappears, the cable 7 receives an external force from the cable end, and the direction of movement is reversed.

図２の（ｄ）および（ｅ）のように、ケーブル７の移動方向が反転する時、ケーブル７の運動はケーブル端の反発力により支配される。ケーブル端は２０Ｈｚ以上の固有振動数ｆ0を持つように設計されているため、２０Ｈｚと比較してゆっくり移動してきたケーブルの力を瞬時に吸収して、逆方向に解放する。この時にケーブル端に加わる力は、振動数ｆ0の単振動として評価できるため、ケーブル端に加わる最大の力をＦとして、Ｆ×sin(2πｆ0ｔ)のように変化する。方向が反転するまでに発生する力積は２Ｆ／２πｆ0である。ケーブル７の重さをｍ、外力が作用していない状態でのケーブル７の速度をｖとすると、力積はケーブル７の運動量変化２ｍｖと等しくなるため、Ｆ＝ｍｖ×２πｆ0となる。   As shown in FIGS. 2D and 2E, when the moving direction of the cable 7 is reversed, the movement of the cable 7 is governed by the repulsive force at the cable end. Since the cable end is designed to have a natural frequency f0 of 20 Hz or more, the cable force that has moved slowly compared to 20 Hz is instantaneously absorbed and released in the reverse direction. Since the force applied to the cable end at this time can be evaluated as a single vibration having the frequency f0, the maximum force applied to the cable end changes to F × sin (2πf0t), where F is the maximum force. The impulse generated until the direction is reversed is 2F / 2πf0. Assuming that the weight of the cable 7 is m and the speed of the cable 7 in a state where no external force is applied is v, the impulse is equal to the momentum change 2 mv of the cable 7, so that F = mv × 2πf0.

ケーブル７が外力を受けていない状態では、ケーブル７に張力が働いていないため、ケーブル７の運動は自由運動に類似する。地震の振動数をｆ 、ケーブルの余長をｌ、地震力をＡ[G]とすると、平衡点からのケーブル７の移動距離は、最大でも余長ｌ＋ケーブル端の移動距離となる。また、ケーブル端の移動距離は、地震力Ａと地震の振動数ｆで決まり、Ａ×９．８／{２πｆ}2となる。余長ｌに左記を加えた移動距離を移動時間ｌ/４ｆで除することにより、ケーブル７の速度をｖ＝(ｌ+Ａ×９．８／{２πｆ}2)×４ｆと評価する。
よって、ケーブル端に加わる最大の力Ｆは、次式で評価できる。
Ｆ＝ｍ×８πｆ0×(ｌ+Ａ×９．８／{２πｆ}2)×ｆ
この評価式に地震力Ａやケーブル端の固有振動数ｆ0、ケーブル余長ｌ、ケーブルの重さｍ、等に数値を入力し、ｆ＝１[Hz]およびｆ＝１０[Hz]でのＦを評価することにより、想定した地震力での最大荷重が求まる。 In a state where the cable 7 is not subjected to an external force, since the cable 7 is not tensioned, the movement of the cable 7 is similar to free movement. Assuming that the frequency of the earthquake is f 1, the surplus length of the cable is l, and the seismic force is A [G], the travel distance of the cable 7 from the equilibrium point is at most surplus length l + the travel distance of the cable end. The moving distance of the cable end is determined by the seismic force A and the seismic frequency f, and is A × 9.8 / {2πf} 2 . The speed of the cable 7 is evaluated as v = (l + A × 9.8 / {2πf} 2 ) × 4f by dividing the travel distance obtained by adding the left to the extra length l by the travel time l / 4f.
Therefore, the maximum force F applied to the cable end can be evaluated by the following equation.
F = m × 8πf 0 × (l + A × 9.8 / {2πf} 2 ) × f
Enter numerical values for the seismic force A, cable end natural frequency f0, cable surplus length l, cable weight m, etc. into this evaluation formula, and F at f = 1 [Hz] and f = 10 [Hz]. The maximum load with the assumed seismic force can be obtained by evaluating.

上記最大荷重が変圧器端子４に印加されている時、図３に示すように変圧器端子４や碍子３は変形せず、荷重は支持金具２に印加される。変圧器端子４に荷重が加わった時、引き出し線９にも荷重が加わるが、引き出し線９は支持金具２と比較して十分柔らかく設計しているため、支持金具２がほぼ全ての荷重を負担する。支持金具２は、全ての荷重を負担しても水平方向に所定値以下、具体的には１ｍｍ以下の変形となるように設計しているため、引き出し線９の変形も１ｍｍ程度として評価可能である。コイル５は、引き出し線９の変形が１ｍｍ以内であれば破損しないように設計しているため、荷重印加時にコイル５は破損しない。
上記のように構成することにより、強い地震力に対しても破損しない端子部を持つ低圧乾式変圧器を得ることができる。 When the maximum load is applied to the transformer terminal 4, the transformer terminal 4 and the insulator 3 are not deformed as shown in FIG. 3, and the load is applied to the support fitting 2. When a load is applied to the transformer terminal 4, a load is also applied to the lead wire 9, but the lead wire 9 is designed to be sufficiently soft compared to the support metal 2, so the support metal 2 bears almost all the load. To do. Since the support fitting 2 is designed to be deformed to a predetermined value or less in the horizontal direction, specifically 1 mm or less even when all loads are applied, the deformation of the lead wire 9 can be evaluated as approximately 1 mm. is there. Since the coil 5 is designed not to be damaged if the deformation of the lead wire 9 is within 1 mm, the coil 5 is not damaged when a load is applied.
By comprising as mentioned above, the low voltage | pressure dry type transformer which has a terminal part which is not damaged with respect to a strong seismic force can be obtained.

なお、本発明は、その発明の範囲内において、実施の形態を適宜、変形、省略することが可能である。   In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

１ 鉄心、 ２ 支持金具、 ３ 碍子、 ４ 変圧器端子、５ コイル、
６ 引き出し線、 ７ ケーブル、 ８ 筐体、 ９ 盤内端子。 1 Iron core 2 Support bracket 3 Insulator 4 Transformer terminal 5 Coil
6 Lead wire, 7 Cable, 8 Housing, 9 Board terminal.

Claims (4)

変圧器鉄心と固定された支持金具、碍子を介して前記支持金具と固定され配線用ケーブルが接続される変圧器端子、変圧器コイルから引き出され前記変圧器端子に接続された引き出し線を備えた変圧器の端子構造において、前記変圧器端子及び前記碍子は変形しない固さを持つ部材で構成して、地震時に受ける前記変圧器端子の荷重が前記碍子を介して前記変圧器端子と固定される前記支持金具に伝わるように構成するとともに、地震時の荷重を受けても前記引き出し線を介して前記変圧器コイルが破損されないよう前記支持金具は前記変圧器端子を固定する位置での水平方向の変位が所定値以下となるように構成されたことを特徴とする変圧器の端子構造。   A support fitting fixed to the transformer core, a transformer terminal fixed to the support fitting via an insulator and connected to a cable for wiring, and a lead wire drawn from the transformer coil and connected to the transformer terminal In the terminal structure of the transformer, the transformer terminal and the insulator are composed of members having a hardness that does not deform, and the load of the transformer terminal that is received during an earthquake is fixed to the transformer terminal via the insulator. The support metal is configured to be transmitted to the support metal, and the support metal is arranged in a horizontal direction at a position where the transformer terminal is fixed so that the transformer coil is not damaged through the lead wire even when receiving a load at the time of an earthquake. A terminal structure of a transformer, characterized in that the displacement is configured to be a predetermined value or less. 地震時の荷重を受けても前記引き出し線を介して前記変圧器コイルが破損されないよう前記支持金具は前記変圧器端子を固定する位置での水平方向の変位が１ｍｍ以下となるように構成されたことを特徴とする請求項１に記載の変圧器の端子構造。   The support bracket is configured such that a horizontal displacement at a position where the transformer terminal is fixed is 1 mm or less so that the transformer coil is not damaged via the lead wire even when receiving an earthquake load. The transformer terminal structure according to claim 1. 前記引き出し線は、前記支持金具に比べて水平方向の変形に対するバネ剛性が１/１０以下となるように構成されたことを特徴とする請求項１または請求項２に記載の変圧器の端子構造。   3. The terminal structure of a transformer according to claim 1, wherein the lead wire is configured so that a spring rigidity with respect to deformation in a horizontal direction is 1/10 or less as compared with the support metal fitting. . 前記変圧器端子及び前記ケーブル端は２０Ｈｚ以上の固有振動数を持つようになされたことを特徴とする請求項１から請求項３のいずれかに記載の変圧器の端子構造。   The transformer terminal structure according to any one of claims 1 to 3, wherein the transformer terminal and the cable end have a natural frequency of 20 Hz or more.
JP2015199825A 2015-10-08 2015-10-08 Terminal structure of transformer Pending JP2017073473A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5540548U (en) * 1978-09-07 1980-03-15
JPS575856Y2 (en) * 1976-09-20 1982-02-03
JPS5846425U (en) * 1981-09-22 1983-03-29 株式会社東芝 molded transformer
JPS633129Y2 (en) * 1981-06-16 1988-01-26
JPH0134333Y2 (en) * 1981-04-22 1989-10-19
JP2005032814A (en) * 2003-07-08 2005-02-03 Japan Ae Power Systems Corp Earthquake-resistant structure transformer
JP2009147196A (en) * 2007-12-17 2009-07-02 Hitachi Industrial Equipment Systems Co Ltd Earthquake-resistant mold transformer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS575856Y2 (en) * 1976-09-20 1982-02-03
JPS5540548U (en) * 1978-09-07 1980-03-15
JPH0134333Y2 (en) * 1981-04-22 1989-10-19
JPS633129Y2 (en) * 1981-06-16 1988-01-26
JPS5846425U (en) * 1981-09-22 1983-03-29 株式会社東芝 molded transformer
JP2005032814A (en) * 2003-07-08 2005-02-03 Japan Ae Power Systems Corp Earthquake-resistant structure transformer
JP2009147196A (en) * 2007-12-17 2009-07-02 Hitachi Industrial Equipment Systems Co Ltd Earthquake-resistant mold transformer

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